Index: firmware/App/Controllers/BloodLeak.c
===================================================================
diff -u -r0e01a5db1f8bb113b7a45faec25ea661b7418af6 -rc72332b4674a895aed7d56ca37ee5230548da3f6
--- firmware/App/Controllers/BloodLeak.c	(.../BloodLeak.c)	(revision 0e01a5db1f8bb113b7a45faec25ea661b7418af6)
+++ firmware/App/Controllers/BloodLeak.c	(.../BloodLeak.c)	(revision c72332b4674a895aed7d56ca37ee5230548da3f6)
@@ -56,7 +56,8 @@
 #define BLOOD_LEAK_WAIT_2_READ_CTRL_U         ( 1 * MS_PER_SECOND / TASK_PRIORITY_INTERVAL )     ///< Blood leak wait to read control U in counts.
 #define BLOOD_LEAK_MAX_SET_POINT_WRITE_TRIALS 3                                                  ///< Blood leak maximum number of trials to write the set point.
 #define BLOOD_LEAK_MAX_CTRL_U_WRITE_TRIALS    3                                                  ///< Blood leak maximum number of trials to write the control U command.
-
+#define BLOOD_LEAK_ZERO_CMD_STATUS_READY      0x80                                               ///< Blood leak zero command status ready value.
+#define BLOOD_LEAK_SELF_TEST_CMD_STATUS_READY 0x80                                               ///< Blood leak self test command status ready value.
 #define BLOOD_LEAK_MIN_WAIT_TIME_2_GET_CAL_MS ( 2 * MS_PER_SECOND )                              ///< Blood leak minimum wait time to get calibration in milliseconds.
 
 #define DATA_PUBLISH_COUNTER_START_COUNT      60                                                 ///< Data publish counter start count.
@@ -623,7 +624,8 @@
 {
     BLOOD_LEAK_STATE_T state = BLOOD_LEAK_INIT_STATE;
 
-    if ( TRUE == bloodLeakZeroRequested )
+    if ( ( TRUE == bloodLeakZeroRequested ) &&
+         ( BLOOD_LEAK_ZERO_CMD_STATUS_READY == ( getFPGABloodLeakZeroStatusCounter() & BLOOD_LEAK_ZERO_CMD_STATUS_READY ) ) )
     {
         state                  = BLOOD_LEAK_ZERO_STATE;
         bloodLeakZeroRequested = FALSE;
@@ -647,25 +649,23 @@
 {
     BLOOD_LEAK_STATE_T state = BLOOD_LEAK_ZERO_STATE;
 
-    if ( TRUE == FPGABloodLeakZeroDetected() )
+    if ( ( TRUE == FPGABloodLeakZeroDetected() ) &&
+         ( BLOOD_LEAK_SELF_TEST_CMD_STATUS_READY == ( getFPGABloodLeakSelfTestErrorCounter() & BLOOD_LEAK_SELF_TEST_CMD_STATUS_READY ) ) )
     {
         state                      = BLOOD_LEAK_SELF_TEST_STATE;
         bloodLeakSelfTestStatus    = SELF_TEST_STATUS_IN_PROGRESS;
         bloodLeakSelfTestStartTime = getMSTimerCount();
 
-        clearFPGABloodLeakZero();
+        //clearFPGABloodLeakZero();  // TODO remove once the BLD has been tested
         setFPGABloodLeakSelfTest();
     }
-    else
+    else if ( TRUE == didTimeout( bloodLeakZeroStartTime, BLOOD_LEAK_TIMEOUT_MS ) )
     {
-        if ( TRUE == didTimeout( bloodLeakZeroStartTime, BLOOD_LEAK_TIMEOUT_MS ) )
-        {
 #ifndef _RELEASE_
-            if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_BLOOD_LEAK_ALARM ) != SW_CONFIG_ENABLE_VALUE )
+        if ( getSoftwareConfigStatus( SW_CONFIG_DISABLE_BLOOD_LEAK_ALARM ) != SW_CONFIG_ENABLE_VALUE )
 #endif
-            {
-                activateAlarmNoData( ALARM_ID_HD_BLOOD_LEAK_FAULT );
-            }
+        {
+            activateAlarmNoData( ALARM_ID_HD_BLOOD_LEAK_FAULT );
         }
     }
 
@@ -689,12 +689,11 @@
         if ( FALSE == noFPGABloodLeakDetected() ) // Faked blood leak caused by independent MCU board
         {
             bloodLeakSelfTestStatus = SELF_TEST_STATUS_PASSED;
-            clearFPGABloodLeakSelfTest();
+            //clearFPGABloodLeakSelfTest();  // TODO remove this function when the BLD is tested
         }
         else if ( TRUE == didTimeout( bloodLeakSelfTestStartTime, BLOOD_LEAK_TIMEOUT_MS ) )
         {
             bloodLeakSelfTestStatus = SELF_TEST_STATUS_FAILED;
-
             activateAlarmNoData( ALARM_ID_HD_BLOOD_LEAK_SELF_TEST_FAILURE );
         }
     }
Index: firmware/App/Services/FPGA.c
===================================================================
diff -u -rd558c3058a027d8f4407c7bb882505e30225a7f9 -rc72332b4674a895aed7d56ca37ee5230548da3f6
--- firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision d558c3058a027d8f4407c7bb882505e30225a7f9)
+++ firmware/App/Services/FPGA.c	(.../FPGA.c)	(revision c72332b4674a895aed7d56ca37ee5230548da3f6)
@@ -242,6 +242,9 @@
     U08 bloodLeakRxErrorCount;                  ///< Reg 447.  Blood leak receive error count.
     U16 bloodLeakRxFIFOCount;                   ///< Reg 448.  Blood leak receive FIFO count.
     U08 bloodLeakRxFIFODataOut;                 ///< Reg 450.  Blood leak receive FIFO data out.
+    U08 dummyByte;                              ///< Reg 451.  Dummy byte to meet the even of the data.
+    U08 bloodLeakSelfTestErrorCounter;          ///< Reg 452.  Blood leak self test error counter.
+    U08 bloodLeakZeroErrorCounter;              ///< Reg 453.  Blood leak zero error counter.
 } FPGA_SENSORS_T;
 
 /// Record structure for FPGA continuous priority writes.
@@ -2228,6 +2231,32 @@
 
 /*********************************************************************//**
  * @brief
+ * The getFPGABloodLeakSelfTestErrorCounter function returns the blood leak
+ * self test error counter.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @return fpgaSensorReadings.bloodLeakSelfTestErrorCounter
+ *************************************************************************/
+U08 getFPGABloodLeakSelfTestErrorCounter( void )
+{
+    return fpgaSensorReadings.bloodLeakSelfTestErrorCounter;
+}
+
+/*********************************************************************//**
+ * @brief
+ * The getFPGABloodLeakZeroErrorCounter function returns the blood leak
+ * zero error counter.
+ * @details Inputs: none
+ * @details Outputs: none
+ * @return fpgaSensorReadings.bloodLeakZeroErrorCounter
+ *************************************************************************/
+U08 getFPGABloodLeakZeroErrorCounter( void )
+{
+    return fpgaSensorReadings.bloodLeakZeroErrorCounter;
+}
+
+/*********************************************************************//**
+ * @brief
  * The noFPGABubbleDetected function returns TRUE if no air bubble has been
  * detected and FALSE if an air bubble has been detected.
  * @details Inputs: fpgaSensorReadings
Index: firmware/App/Services/FPGA.h
===================================================================
diff -u -rd558c3058a027d8f4407c7bb882505e30225a7f9 -rc72332b4674a895aed7d56ca37ee5230548da3f6
--- firmware/App/Services/FPGA.h	(.../FPGA.h)	(revision d558c3058a027d8f4407c7bb882505e30225a7f9)
+++ firmware/App/Services/FPGA.h	(.../FPGA.h)	(revision c72332b4674a895aed7d56ca37ee5230548da3f6)
@@ -144,6 +144,8 @@
 U16  getFPGABloodLeakRxFIFOCount( void );
 U08  getFPGABloodLeakRxErrorCount( void );
 U08  getFPGABloodLeakRxFIFODataOut( void );
+U08  getFPGABloodLeakSelfTestErrorCounter( void );
+U08  getFPGABloodLeakZeroErrorCounter( void );
 
 BOOL noFPGABubbleDetected( U32 bubble );
 void setFPGABubbleSelfTest( U32 bubble );